Herokuにアップロードできない

これからアプリケーションを作成しようとしており、最低限ルーティングなどを設定した段階で一度Herokuにアップロードしようとしています。

heroku run rake db:migrateコマンドを打ち込むと以下のようなエラーが出るのですが、これの原因がわかりません。

$ heroku run rake db:migrate
Running rake db:migrate attached to terminal... up, run.2993
rake aborted!
NameError: undefined local variable or method config' for main:Object /app/config/environments/production.rb:1:in <top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in block in require'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in load_dependency' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in require'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:598:in block (2 levels) in <class:Engine>' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:597:in each'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/engine.rb:597:in block in <class:Engine>' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in instance_exec'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in run' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in block in run_initializers'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in each' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:44:in tsort_each_child'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in run_initializers' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:352:in initialize!'
/app/config/environment.rb:5:in <top (required)>' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:328:in require'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:328:in require_environment!' /app/vendor/bundle/ruby/2.0.0/gems/railties-4.2.0/lib/rails/application.rb:443:in block in run_tasks_blocks'
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)